Yes, this was a concern for me also, and one reason why the 30 and 35-1/2 are on my list, as they do not have cored hulls. IIRC, all the boats below 35 use solid hulls; the 35-3 is cored, but the mk 1 and 2 are not. The Niagaras are also cored, and every one I've seen has seen extensive offshore...